Board



H. C. LORD. BOARD. APPLICATION FILED OCT. I, 1919- 1,433 896, Patented Oct. 31, 1922. I

Patented Get. 31, 1922.

UNITED {sures 1,433,896 PATENT ormer.

HUGH C. LORD, OF ERIE, PENNSYLVANIA.

" BOARD.

Application filed October 1, 1919. Serial No. 327,623.

To aZZwhom it may concern:

Be'it known that I, HUGH C. ,LORD, a citizen of the United States, residing at Erie, in the county of Erie and State of Pennsyl-v Vania, have invented new and useful Improvements in Boards, of which the following is a specification.

The invention is illustrated in the accompanying drawings as follows:

Fig. 1 shows a section of a board formed in accordance with the invention.

Fig. 2 an elevation of the same.

Fig. 3 an end view of one of the board sections.

The board 3 is made up of narrow strips 4 arranged vertically in forming, for example, the lining of a silo. The strips are provided with the tongues 5 and grooves 6 somewhat in the manner of flooring. A slit 7 is sawed into the edge of the strip starting at the edge of the tongue and extending inwardly far enough to permit the spring ing of the sides of the tongue together. Preferably the tongue and groove are so proportioned that when the slitted tongue is forced into the groove the slit is entirely closed so that there is a positive fit between the walls of the tongue and the walls of the groove. In addition to this fit which comes from the contact with the faces of the slit there is the springing of the wood which tends to open the tongue and keep the faces of the tongue in contact with the side faces of the groove so that if there is any shrinkage of the material a tight joint is maintained. In some instances and with some kinds of wood it may be desirable to reduce the thickness of the strip adjacent to the slit so as to permit of the more ready springing of the wood to allow the closing of the tongue. This may be accomplished by run ning a groove 8 in the back face of the strip adjacent to the slit.

Difiiculty is also experienced in making a tight joint when the ends of the strips abut. It has been common to slit the ends of the strips, the slit ordinarily being arranged in the center of the strip and running from the edge of the tongue to the bottom of the groove. With this construction as soon as there is any shrinkage which draws the edge of the tongue away from the bottom of the groove a small opening is made possible at this point. This is obviated in the present construction. In the present construction a slit 9 extends across the end of the strips.

An insert 10 is arranged in the slit 9. The slit 9 is extended in the form of a notch 11 in onewall or face of the tongue and in the form of a notch 12 in one face or wall of the groove so that wnen the insert 10 in is place the face of the insert comes flush with the wall of the groove and the wall of the tongue. In this way there is a lapped joint by reason of the insert 10 as well as other parts of the tongue.

N hat I claim as new is:

l. A board made up of pieces, one of which is intermediate; and a joint between said intermediate piece and a piece adjacent comprising a tongue and groove, the piece having the tongue being slit from the edge of the tongueinwardly and the tongue having an initial thickness greater than the width of the groove whereby the parts of the tongue are swung toward each other as the tongue is forced into groove.

2. A board made up of pieces, one of which is intermediate; and a joint between said intermediate piece and a piece adjacent comprising a tongue and groove, the piece having the tongue being slit from the edge of the tongue inwardly and the tongue having an initial thickness greater than the width of the groove whereby the parts of the tongue are swung toward each other and into contact as the tongue is forced into the groove.

3. A board made up of a plurality of strips each having at one edge a groove and at the other edge a tongue, the tongue edges being slit from the edge of the tongue inwardly and the tongue having an initial thickness greater than the width of the groove.

4:. A board made up of a plurality of strips each having at one edge a groove and at the other edge a tongue, the tongue being slit from the edge of the tongue inwardly, the thickness of the tongue being such as to force the walls at the sides of the slit into contact as the tongue is forced into a groove.

5. A board made up of strips having tongue and groove connections and having a joint between abutting ends of strips formed by slitting the ends of said strips, said slits being extended in the form of notches in the walls of the grooves; and an insert in said slits extending into said notches.

6. A board made up of strips having tongue and groove connections and having formed by slitting the ends of said strips,

said slits being extended in the, form of notches in the faces of the ends of the tongues; and an insert in the slits extending into the notches.

7. A board made up of strips having tongue and groove connections and havinge joint between abutting ends of strips formed by slitting the ends of said strips, said slits being extended in the form of notches in the Walls of the ends of thegrooves and notches in the faces of the ends of the tongues at the opposite sides of the strips; and inserts ar ranged in said slits said inset-ts extending into said notches.

8. A board made. up of strips having tongue and groove connections and having a joint between abut-ting ends of strips formed by slitting the ends of said strips said slits" being extended in the form of my hand.

C. LORD. 

